death by audio - germanium filter
some gut shots that might be of interest!
Another clearer pic:
Hey! .. some movement from a ‘redditor’ over at the diypedals subreddit.
Hopefully this ignites some momentum!
https://www.falstad.com/afilter/
Copy below and go to ‘insert from txt’
$ 1 0.000005 5 50 5 50
% 0 20615.097787781793
c 112 144 112 192 0 4.7000000000000004e-8 0
r 64 144 112 144 0 33000
O 144 112 256 112 0
g 112 192 112 208 0
170 64 144 32 144 3 20 1000 5 0.1
174 112 144 144 80 0 500000 0.9950000000000001 Resistance
c 112 80 64 80 0 1e-9 0
w 64 144 64 80 0
r 112 80 160 80 0 33000
c 160 80 160 32 0 2.2000000000000003e-9 0
g 160 32 192 32 0
o 4 16 0 34 5 0.00009765625 0 -1 in
o 2 16 0 34 2.5 0.00009765625 1 -1 out
Hopefully this ignites some momentum!
https://www.falstad.com/afilter/
Copy below and go to ‘insert from txt’
$ 1 0.000005 5 50 5 50
% 0 20615.097787781793
c 112 144 112 192 0 4.7000000000000004e-8 0
r 64 144 112 144 0 33000
O 144 112 256 112 0
g 112 192 112 208 0
170 64 144 32 144 3 20 1000 5 0.1
174 112 144 144 80 0 500000 0.9950000000000001 Resistance
c 112 80 64 80 0 1e-9 0
w 64 144 64 80 0
r 112 80 160 80 0 33000
c 160 80 160 32 0 2.2000000000000003e-9 0
g 160 32 192 32 0
o 4 16 0 34 5 0.00009765625 0 -1 in
o 2 16 0 34 2.5 0.00009765625 1 -1 out
MOSFET boost (similar to SHO) > inverted PNP germ gain stage > Fuzz War II tone control (mostly) > inverted PNP germ gain stage (collector bypassed 2.2u).
Gain: B50K, Tone: A500K, Volume (trim pot): 100K
Enjoy!
Amazing..! Ideally someone that knows more than me can whip up a layout off the back of your dissection!
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That would explain the absence of some integrated circuits.
"It crackles....., but that's ok"
Thank you so much for the teardown! Very interesting.
While a work-a-like is definitely doable, knowing DBA, it most likely is a "twisted" take on a gain stage. They call it a "drive circuitry in the style of classic recording consoles". Just like the Hudson Broadcast, I note. That one was inspired by "old RCA consoles". Perhaps the BA-71 preamps?
Perhaps someone - more of an electronics wiz than I - could make a schematic that combines an SHO (https://external-preview.redd.it/dKsAR- ... b8d928eff4) into a germanium console stage from something like a RCA ba-71 (http://www.jlmaudio.com/RCA/BA-71A%201024.jpg) into the fuzz war mk 2 filter (https://www.pedalpcb.com/docs/BellumMKII-PedalPCB.pdf) into yet another ba-71 stage...
I'm sure mr. Fuzzhead/Dirtboxlayouts.blogspot.com would be willing to do the vero.
- tome.talevski
- Breadboard Brother
Any movement or interest on some of these ideas?Sesh wrote: ↑05 Jul 2022, 13:01Thank you so much for the teardown! Very interesting.
While a work-a-like is definitely doable, knowing DBA, it most likely is a "twisted" take on a gain stage. They call it a "drive circuitry in the style of classic recording consoles". Just like the Hudson Broadcast, I note. That one was inspired by "old RCA consoles". Perhaps the BA-71 preamps?
Perhaps someone - more of an electronics wiz than I - could make a schematic that combines an SHO (https://external-preview.redd.it/dKsAR- ... b8d928eff4) into a germanium console stage from something like a RCA ba-71 (http://www.jlmaudio.com/RCA/BA-71A%201024.jpg) into the fuzz war mk 2 filter (https://www.pedalpcb.com/docs/BellumMKII-PedalPCB.pdf) into yet another ba-71 stage...
I'm sure mr. Fuzzhead/Dirtboxlayouts.blogspot.com would be willing to do the vero.
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Is there a verified schematic for this one out there?
don't think so. AFAIK there's only mine above, which is probably incorrect and missing the output. Someone should breadboard it and see, at the very least. Hopefully someone with access to a unit can trace it properly.